Defensive publication

ABSTRACT

CERTAIN SUBSTITUTED P-(HYDROXYPHENYL)ACETIC ACIDS, TYPIFIED BY 2-METHYL-2-(P-HYDROXYPHENYL) PROPIONIC ACID, MAY BE PREPARED BY HYDROGENATION OF THE MONO-BETA-LACTONES PREPARED FROM DISUBSTITUTED KETENES AND P-QUINONES, AT TEMPERATURES WITHIN THE RANGE OF 0-150* C. AND PRESSURES RANGING FROM ONE TO SEVERAL HUNDRED ATMOSPHERES IN THE PRESENCE OF A HYDROGENATION CATALYST SUCH AS PALLADIUM, PLATINUM, RODIUM, RUTHENIUM OR NICKEL. THE ACID PRODUCTS OBTAINED BY THE PROCESS MAY BE READILY CONVERTED BY WELL-KNOWN AUTOPOLYMERIZATION PROCEDURES TO POLYESTERS USEFUL IN THE PRODUCTION OF CLEAR, TRANSPARENT SHEETS, FILMS, FILAMENTS, FIBERS, MOLDED ARTICLES AND OTHER VALUABLE ARTICLES OF COMMERCE HAVING EXCELLENT PHYSICAL PROPERTIES.

DEFENSIVE PUBLICATIGN UNITED STATES PATENT OFFICE Published at the request of the applicant or owner in accordance with the Notice of Dec. 16, 1969, 869 O.G. 687. The abstracts of Defensive Publication applications are identified by distinctly numbered series and are arranged chronologically. The heading of each abstract indicates the number of pages of specification, including claims and sheets of drawings contained in the application as originally filed. The files of these applications are available to the public for inspection and reproduction may be purchased for 30 cents a sheet.

Defensive Publication applications have not been examined as to the merits of alleged invention. The Patent Ofiice makes no assertion us to the novelty of the disclosed subject matter.

PUBLISHED MARCH 27, 1973 T908 009 PROCESS OF PREPAIRIING SUBSTITUTED p-(HYDRDXYPHENYL) ACETIC ACIDS James C. Martin, 601 N. Mountain View Circle, Johnson City, Tenn. 37601, and Paul G. Gott, 1017 Watauga St., Kingsport, Tenn. 37660 Filed Dec. 8, 1971, Ser. No. 206,178 Int. Cl. C07c 65/02 US. Cl. 260-521 R No Drawing. 12 Pages Specification Certain substituted p-(hydroxyphenyl)acetic acids, typified by 2-methyl-2-(p-hydroxyphenyl) propionic acid, may be prepared by hydrogenation of the mono-beta-lactones prepared from disubstituted ketenes and p-quinones, at temperatures Within the range of 0l50 C. and pressures ranging from one to several hundred atmospheres in the presence of a hydrogenation catalyst such as palladium, platinum, rhodium, ruthenium or nickel. The acid products obtained by the process may be readily converted by well-known autopolyrnerization procedures to polyesters useful in the production of clear, transparent sheets, films, filaments, fibers, molded articles and other valuable arti- 0165 of commerce having excellent physical properties. 

